Welcome to Washington County ...Time Zone: Washington County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time. The community of Jonesborough is the Seat for Washington County. Washington County was founded in 1777. From the Census Estimates for 2019, <1> Washington had a population of 129,375 people. This is an increase of 4.86% since the last Census (which gave a population of 123,384 people in 2010). At the time of the 2010 Census, Washington represented 1.94% of the total population of Tennessee. Websites of Interest ...
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